|  | // Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file | 
|  | // for details. All rights reserved. Use of this source code is governed by a | 
|  | // BSD-style license that can be found in the LICENSE file. | 
|  |  | 
|  | import 'dart:async'; | 
|  |  | 
|  | import 'package:async_helper/async_helper.dart'; | 
|  | import 'package:expect/expect.dart'; | 
|  |  | 
|  | void main() async { | 
|  | asyncStart(); | 
|  | testVoid(); | 
|  | await testFutureVoid(); | 
|  | asyncEnd(); | 
|  | } | 
|  |  | 
|  | void testVoid() { | 
|  | void x = int.parse('42'); | 
|  | Expect.equals(42, x as dynamic); | 
|  | } | 
|  |  | 
|  | Future testFutureVoid() async { | 
|  | final controller = StreamController(onCancel: () async => int.parse('42')); | 
|  | final subscription = controller.stream.listen(null); | 
|  | Expect.equals(42, (await subscription.cancel()) as dynamic); | 
|  | } |